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A305249
Number of nX5 0..1 arrays with every element unequal to 0, 1, 3, 4 or 8 king-move adjacent elements, with upper left element zero.
1
8, 35, 34, 79, 203, 439, 1010, 2382, 5699, 13811, 33747, 82601, 203917, 507126, 1264787, 3160200, 7913799, 19862255, 49931957, 125642182, 316372417, 797186969, 2009925584, 5069682263, 12790992384, 32279577446, 81477816804, 205693851559
OFFSET
1,1
COMMENTS
Column 5 of A305252.
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) -7*a(n-2) +7*a(n-3) -11*a(n-4) -15*a(n-5) -2*a(n-6) +24*a(n-7) +90*a(n-8) +114*a(n-9) +65*a(n-10) -215*a(n-11) -359*a(n-12) -557*a(n-13) -219*a(n-14) -248*a(n-15) -165*a(n-16) +299*a(n-17) +1844*a(n-18) +3254*a(n-19) +4522*a(n-20) +3801*a(n-21) -535*a(n-22) -4333*a(n-23) -8392*a(n-24) -8789*a(n-25) -9020*a(n-26) -9138*a(n-27) -4016*a(n-28) +2513*a(n-29) +9438*a(n-30) +13706*a(n-31) +12986*a(n-32) +10225*a(n-33) +7846*a(n-34) +3475*a(n-35) +7*a(n-36) -4527*a(n-37) -6898*a(n-38) -6562*a(n-39) -5807*a(n-40) -3583*a(n-41) -1569*a(n-42) +99*a(n-43) +872*a(n-44) +998*a(n-45) +818*a(n-46) +591*a(n-47) +283*a(n-48) +122*a(n-49) -24*a(n-50) -38*a(n-51) -21*a(n-52) -8*a(n-53) -a(n-54) for n>59
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..1..1..1..1. .0..0..0..0..0. .0..1..1..1..1
..0..0..0..0..0. .1..1..1..1..1. .0..0..0..0..1. .1..1..1..1..1
..0..1..0..0..0. .1..1..1..1..1. .0..0..0..1..1. .1..1..1..1..1
..0..0..0..0..0. .0..1..1..1..1. .0..0..1..1..1. .1..1..1..0..1
..0..0..0..0..1. .0..0..1..1..1. .0..1..1..1..1. .0..1..1..1..1
CROSSREFS
Cf. A305252.
Sequence in context: A303805 A360658 A304852 * A316549 A304541 A306126
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 28 2018
STATUS
approved